By Andrew C. Grimsdale, Klaus Müllen (auth.), Ullrich Scherf, Dieter Neher (eds.)
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Extra info for Polyfluorenes
1 below), so a probable structure for the defect in LPPPs is a ketone as in 112 (Scheme 51). As the ketone in 112 has more extended conjugation than in ﬂuorenone (39) one would expect the emission from it to be bathochromically shifted, which is consistent with the long-wavelength emission from LPPPs occurring at 560–600 nm, and that from polyﬂuorenes at about 530 nm. C. Grimsdale · K. Müllen Scheme 51 Proposed emissive defect in ladder-type PPPs The ketone 112 presumably arises from oxidation of the methine bridge by oxygen from the air.
The key step is the polymer analogous Friedel-Crafts ringclosing reaction on the polyalcohol 104, obtained by the reduction of 103. This was found to proceed quickly and smoothly upon addition of borontriﬂuoride to a solution of 104 in dichloromethane. The reaction appeared to be complete by both NMR and MALDI-TOF analysis, indicating the presence of less than 1% of defects due to incomplete ring closure. C. Grimsdale · K. Müllen ber average molecular weights (Mn ) of up to 50 000 g/mol have been obtained corresponding to about 150 phenylene rings.
Sources of Undesirable Green Emission in PF-based PLEDs . . 2 PFs with Various Emission Colors . . . . . . . . Green and Red Emitters . . . . . . . . . . . Chemical Strategy via Fluorescent Moiety Incorporated in Polymer Backbone, Side Chain, or Chain End Chemical Strategy via Phosphorescent Moiety Incorporated in Polymer Side Chain and Backbone . . . White Emitters . . . . . . . . . . . . . Physical Blending System . . . . .
Polyfluorenes by Andrew C. Grimsdale, Klaus Müllen (auth.), Ullrich Scherf, Dieter Neher (eds.)